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            <div class="post-toc animated"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#%E5%BC%82%E6%AD%A5"><span class="nav-number">1.</span> <span class="nav-text">异步</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#%E5%BC%82%E6%AD%A5%E5%8F%91%E5%B1%95%E9%98%B6%E6%AE%B5"><span class="nav-number">1.1.</span> <span class="nav-text">异步发展阶段</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#%E5%9B%9E%E8%B0%83%E5%87%BD%E6%95%B0"><span class="nav-number">1.1.1.</span> <span class="nav-text">回调函数</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#generator"><span class="nav-number">1.1.2.</span> <span class="nav-text">generator()</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#promise"><span class="nav-number">1.1.3.</span> <span class="nav-text">promise</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#async-await"><span class="nav-number">1.1.4.</span> <span class="nav-text">async&#x2F;await</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#%E5%AE%83%E7%9A%84%E7%89%B9%E7%82%B9%E6%98%AF%E4%BB%80%E4%B9%88"><span class="nav-number">1.2.</span> <span class="nav-text">它的特点是什么</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#%E5%B0%B1%E6%98%AF%E5%BC%82%E6%AD%A5%E4%BB%BB%E5%8A%A1%E7%9A%84%E6%89%A7%E8%A1%8C%E6%98%AF%E4%B8%8D%E4%BC%9A%E9%98%BB%E5%A1%9E%EF%BC%8C%E4%B9%8B%E5%90%8E%E4%BB%A3%E7%A0%81%E7%9A%84%E6%89%A7%E8%A1%8C%EF%BC%8C%E5%8F%AF%E4%BB%A5%E7%AD%89%E4%B9%8B%E5%90%8E%E7%9A%84%E4%BB%BB%E5%8A%A1%E6%89%A7%E8%A1%8C%E5%90%8E%E5%86%8D%E5%8E%BB%E6%89%A7%E8%A1%8C%EF%BC%9B"><span class="nav-number">1.2.1.</span> <span class="nav-text">就是异步任务的执行是不会阻塞，之后代码的执行，可以等之后的任务执行后再去执行；</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E4%B8%80%E8%A8%80%E4%BB%A5%E8%94%BD%E4%B9%8B"><span class="nav-number">1.2.2.</span> <span class="nav-text">一言以蔽之</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#%E9%82%A3%E4%B9%88%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E6%9C%89%E5%BC%82%E6%AD%A5"><span class="nav-number">1.3.</span> <span class="nav-text">那么为什么要有异步</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#%E6%9C%89%E4%BA%9B%E7%BD%91%E7%BB%9C%E8%AF%B7%E6%B1%82%E5%AE%9E%E5%9C%A8%E6%98%AF%E5%A4%AA%E8%80%97%E8%B4%B9%E6%97%B6%E9%97%B4%E4%BA%86%EF%BC%8C%E5%A6%82%E6%9E%9C%E4%B8%8D%E5%BC%95%E5%85%A5%E5%BC%82%E6%AD%A5%E6%9C%BA%E5%88%B6%E7%9A%84%E8%AF%9D%E4%BC%9A%E6%B5%AA%E8%B4%B9%E6%97%B6%E9%97%B4%EF%BC%8C%E7%94%A8%E5%90%8C%E6%AD%A5%E7%9A%84%E8%AF%9D%EF%BC%8C%E5%8F%AA%E8%A6%81%E7%AC%AC%E4%B8%80%E4%B8%AA%E4%BB%BB%E5%8A%A1%E6%B2%A1%E5%AE%8C%E6%88%90%E5%90%8E%E9%9D%A2%E7%9A%84%E4%BB%BB%E5%8A%A1%E5%85%A8%E9%83%A8%E9%98%BB%E5%A1%9E%E4%BA%86"><span class="nav-number">1.3.1.</span> <span class="nav-text">有些网络请求实在是太耗费时间了，如果不引入异步机制的话会浪费时间，用同步的话，只要第一个任务没完成后面的任务全部阻塞了</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#%E5%93%AA%E4%BA%9B%E5%B1%9E%E4%BA%8E%E5%BC%82%E6%AD%A5%E4%BB%BB%E5%8A%A1"><span class="nav-number">1.4.</span> <span class="nav-text">哪些属于异步任务</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#settimeout"><span class="nav-number">1.4.1.</span> <span class="nav-text">settimeout()</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#dom%E4%BA%8B%E4%BB%B6"><span class="nav-number">1.4.2.</span> <span class="nav-text">dom事件</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#AJAX-AXIOS%E8%AF%B7%E6%B1%82"><span class="nav-number">1.4.3.</span> <span class="nav-text">AJAX&#x2F;AXIOS请求</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#setinterval"><span class="nav-number">1.4.4.</span> <span class="nav-text">setinterval()</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E5%9B%9E%E8%B0%83%E5%87%BD%E6%95%B0-1"><span class="nav-number">1.4.5.</span> <span class="nav-text">回调函数</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#%E9%82%A3%E6%80%8E%E4%B9%88%E8%A7%A3%E5%86%B3%E5%BC%82%E6%AD%A5%E5%9B%9E%E8%B0%83%E7%9A%84%E9%97%AE%E9%A2%98"><span class="nav-number">1.5.</span> <span class="nav-text">那怎么解决异步回调的问题</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#%E5%9B%9E%E8%B0%83%E5%9C%B0%E7%8B%B1"><span class="nav-number">1.5.1.</span> <span class="nav-text">回调地狱</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#%E4%B8%BB%E9%A2%98"><span class="nav-number">1.6.</span> <span class="nav-text">主题</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#%E4%B8%BB%E9%A2%98-1"><span class="nav-number">1.7.</span> <span class="nav-text">主题</span></a></li></ol></li></ol></div>
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          垃圾回收机制
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        <h1 id="异步"><a href="#异步" class="headerlink" title="异步"></a>异步</h1><h2 id="异步发展阶段"><a href="#异步发展阶段" class="headerlink" title="异步发展阶段"></a>异步发展阶段</h2><h3 id="回调函数"><a href="#回调函数" class="headerlink" title="回调函数"></a>回调函数</h3><h3 id="generator"><a href="#generator" class="headerlink" title="generator()"></a>generator()</h3><h3 id="promise"><a href="#promise" class="headerlink" title="promise"></a>promise</h3><ul>
<li><p>为什么有promise</p>
<ul>
<li><p>避免出现回调地狱</p>
</li>
<li><p>它是如何避免的</p>
<ul>
<li>通过.then的链式调用，从而避免的了不断嵌套的回调地狱</li>
</ul>
</li>
</ul>
</li>
<li><p>它有哪些状态</p>
<ul>
<li><p>pending</p>
<ul>
<li>new/创建 一个promise后的状态</li>
</ul>
</li>
<li><p>fulfilled</p>
<ul>
<li>调用promise.resolve()的方法后</li>
</ul>
</li>
<li><p>rejected</p>
<ul>
<li>异步任务出错/或是抛出异常后//但是如果仅仅是return 了一个错误对象，也是不行的</li>
<li>调用promise.reject()</li>
</ul>
</li>
</ul>
</li>
<li><p>不同状态所触发的方法</p>
<ul>
<li><p>then()</p>
<ul>
<li><p>首先当promise对象为fullfiled时会触发</p>
</li>
<li><p>里面只能接收一个函数，其它类型一律无视</p>
</li>
<li><p>并且会返回一个新的fullfiled(一般情况下，如果throw了一个错误)promise对象</p>
<ul>
<li>这也解答了自己一个疑惑就是说，为什么then可以链式来调用，不是状态只能变一次吗，其实是因为又新建了一个新的promise对象</li>
</ul>
</li>
</ul>
</li>
<li><p>catch()</p>
<ul>
<li>当状态为rejected时触发</li>
<li>返回了一个具有fullfiled状态的promise对象</li>
</ul>
</li>
<li><p>finally</p>
<ul>
<li>无论什么状态，最终都会执行的函数</li>
</ul>
</li>
</ul>
</li>
<li><p>谨记一点就是</p>
<ul>
<li><p>promise的状态的改变是不可逆的</p>
<ul>
<li><p>一旦成为fullfilled状态，或是rejected状态</p>
</li>
<li><p>即便是同状态的改变也不可以</p>
</li>
<li><p>核心</p>
<ul>
<li>状态仅能改变一次</li>
<li>再具体一点就是说，一旦状态变了，后续,resolve(),reject()方法全部失效</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>有哪些方法</p>
<ul>
<li><p>resolve(value)</p>
<ul>
<li><p>成功</p>
<ul>
<li>Subtopic</li>
</ul>
</li>
<li><p>value是一个带有then()方法的对象</p>
<ul>
<li><p>由then()方法所返回状态来决定</p>
<ul>
<li>从这可以看出来，then()方法返回的并不一定是成功的状态</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>reject( )</p>
<ul>
<li>promise.reject()所返回的是失败状态的promise对象</li>
</ul>
</li>
<li><p>race（）</p>
</li>
<li><p>all()</p>
</li>
</ul>
</li>
</ul>
<h3 id="async-await"><a href="#async-await" class="headerlink" title="async/await"></a>async/await</h3><ul>
<li><p>原因</p>
<ul>
<li>已经有了promise为什么还要有它</li>
</ul>
</li>
<li><p>这里先记住一点就是，await 一旦出现意味着之后所有的任务全部都是，异步任务，async所声明的函数本身依然属于同步任务</p>
</li>
<li><p>记住await</p>
<ul>
<li>普通值</li>
<li>函数</li>
</ul>
</li>
</ul>
<h2 id="它的特点是什么"><a href="#它的特点是什么" class="headerlink" title="它的特点是什么"></a>它的特点是什么</h2><h3 id="就是异步任务的执行是不会阻塞，之后代码的执行，可以等之后的任务执行后再去执行；"><a href="#就是异步任务的执行是不会阻塞，之后代码的执行，可以等之后的任务执行后再去执行；" class="headerlink" title="就是异步任务的执行是不会阻塞，之后代码的执行，可以等之后的任务执行后再去执行；"></a>就是异步任务的执行是不会阻塞，之后代码的执行，可以等之后的任务执行后再去执行；</h3><h3 id="一言以蔽之"><a href="#一言以蔽之" class="headerlink" title="一言以蔽之"></a>一言以蔽之</h3><ul>
<li>不会去立刻执行的任务</li>
<li>新理解：函数执行后不会立刻返回结果，并且不阻塞之后的任务</li>
</ul>
<h2 id="那么为什么要有异步"><a href="#那么为什么要有异步" class="headerlink" title="那么为什么要有异步"></a>那么为什么要有异步</h2><h3 id="有些网络请求实在是太耗费时间了，如果不引入异步机制的话会浪费时间，用同步的话，只要第一个任务没完成后面的任务全部阻塞了"><a href="#有些网络请求实在是太耗费时间了，如果不引入异步机制的话会浪费时间，用同步的话，只要第一个任务没完成后面的任务全部阻塞了" class="headerlink" title="有些网络请求实在是太耗费时间了，如果不引入异步机制的话会浪费时间，用同步的话，只要第一个任务没完成后面的任务全部阻塞了"></a>有些网络请求实在是太耗费时间了，如果不引入异步机制的话会浪费时间，用同步的话，只要第一个任务没完成后面的任务全部阻塞了</h3><h2 id="哪些属于异步任务"><a href="#哪些属于异步任务" class="headerlink" title="哪些属于异步任务"></a>哪些属于异步任务</h2><h3 id="settimeout"><a href="#settimeout" class="headerlink" title="settimeout()"></a>settimeout()</h3><h3 id="dom事件"><a href="#dom事件" class="headerlink" title="dom事件"></a>dom事件</h3><ul>
<li>子主题</li>
</ul>
<h3 id="AJAX-AXIOS请求"><a href="#AJAX-AXIOS请求" class="headerlink" title="AJAX/AXIOS请求"></a>AJAX/AXIOS请求</h3><h3 id="setinterval"><a href="#setinterval" class="headerlink" title="setinterval()"></a>setinterval()</h3><h3 id="回调函数-1"><a href="#回调函数-1" class="headerlink" title="回调函数"></a>回调函数</h3><ul>
<li><p>先明确一下什么是回调函数</p>
<ul>
<li><p>就是当一个a函数作为函数b的参数，并且由这个b函数来执行这个a函数//那么a就是回调函数</p>
</li>
<li><p>那它和异步有什么关系</p>
<ul>
<li>回调函数能够获得异步任务的结果</li>
</ul>
</li>
</ul>
</li>
</ul>
<h2 id="那怎么解决异步回调的问题"><a href="#那怎么解决异步回调的问题" class="headerlink" title="那怎么解决异步回调的问题"></a>那怎么解决异步回调的问题</h2><h3 id="回调地狱"><a href="#回调地狱" class="headerlink" title="回调地狱"></a>回调地狱</h3><ul>
<li>当前执行的任务依赖上一个任务的执行的结果，并在上一个任务的回调中去执行</li>
</ul>
<h2 id="主题"><a href="#主题" class="headerlink" title="主题"></a>主题</h2><h2 id="主题-1"><a href="#主题-1" class="headerlink" title="主题"></a>主题</h2>
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